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Why do oxygen levels change when using just oxygen & then using oxygen with a CPAP?
Husband has COPD & uses oxygen 24/7. He has an oxygen concentrator & also uses a CPAP. Recently on just the oxygen his readings are in the low 70's & he can hardly do anything without being extremely out of breath. If he uses the oxygen with the CPAP his readings go into the low 90's. trying to understand why the big difference.
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